Antimalarial Activity of New Dihydroartemisinin Derivatives. 7. 4-(<i>p</i>-Substituted phenyl)-4(<i>R</i> or <i>S</i>)-[10(α or β)-dihydroartemisininoxy]butyric Acids<sup>1-6</sup>
作者:Ai J. Lin、Akram B. Zikry、Dennis E. Kyle
DOI:10.1021/jm9607919
日期:1997.4.1
or S)-[10(alpha or beta)-dihydroartemisininoxy]butyric acids were synthesized as new potential antimalarial agents. Two approaches were taken in the design of these new molecules in an attempt to (a) increase the lipophilicity of the molecule and (b) decrease the rate of oxidative dealkylation of the target compounds. The new compounds showed a 2-10-fold increase in in vitro antimalarial activity against
为了寻找比青蒿酸或青蒿酸具有更高功效和更长血浆半衰期的水溶性双氢青蒿素衍生物,一系列新的 4-(对位取代苯基)-4(R 或 S)-[10(α 或β)立体异构体)-dihydroartemisininoxy]butyric 酸作为新的潜在抗疟剂被合成。在设计这些新分子时采用了两种方法,以尝试 (a) 增加分子的亲油性和 (b) 降低目标化合物的氧化脱烷基化速率。与青蒿素或蒿酸相比,新化合物对恶性疟原虫的 D-6 和 W-2 克隆的体外抗疟活性提高了 2-10 倍。R-非对映异构体通常比相应的 S-非对映异构体更有效。对氯苯基和对溴苯基衍生物对伯氏疟原虫(治愈 3/8)的体内口服抗疟活性优于蒿酸(治愈 1/8),而对氟苯基和对甲氧基苯基类似物仅表现出活性与相同剂量水平(每天两次 64 mg/kg)的蒿甲酸相当(1/8 治愈)。这些新化合物的体内抗疟活性与其 SD50(50% 寄生虫血症抑制剂量